[virt-viewer v1] Fix implicit fallthrough warning on new gcc

[Victor Toso <victortoso@xxxxxxxxxx>]

From: Victor Toso <me@xxxxxxxxxxxxxx>

The option -Wimplicit-fallthrough was added to -Wall recently which
generates a few warnings. Based on the comment above the switch, the
fallthrough is on purpose so let's add a comment to avoid the following
warnings.

ovirt-foreign-menu.c: In function 'ovirt_foreign_menu_next_async_step':
ovirt-foreign-menu.c:293:12: warning: this statement may fall through
         if (menu->priv->api == NULL) {
            ^
 ovirt-foreign-menu.c:297:5: note: here
      case STATE_VM:
           ^~~~
ovirt-foreign-menu.c:298:12: warning: this statement may fall through
         if (menu->priv->vm == NULL) {
            ^
ovirt-foreign-menu.c:302:5: note: here
     case STATE_STORAGE_DOMAIN:
          ^~~~
ovirt-foreign-menu.c:303:12: warning: this statement may fall through
         if (menu->priv->files == NULL) {
            ^
ovirt-foreign-menu.c:307:5: note: here
     case STATE_VM_CDROM:
          ^~~~

ovirt-foreign-menu.c:308:12: warning: this statement may fall through
         if (menu->priv->cdrom == NULL) {
            ^
ovirt-foreign-menu.c:312:5: note: here
   case STATE_CDROM_FILE:
        ^~~~

Signed-off-by: Victor Toso <victortoso@xxxxxxxxxx>
---
 src/ovirt-foreign-menu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ovirt-foreign-menu.c b/src/ovirt-foreign-menu.c
index 2939ae5..fdfd327 100644
--- a/src/ovirt-foreign-menu.c
+++ b/src/ovirt-foreign-menu.c
@@ -294,21 +294,25 @@ ovirt_foreign_menu_next_async_step(OvirtForeignMenu *menu,
             ovirt_foreign_menu_fetch_api_async(menu, task);
             break;
         }
+        /* fall through */
     case STATE_VM:
         if (menu->priv->vm == NULL) {
             ovirt_foreign_menu_fetch_vm_async(menu, task);
             break;
         }
+        /* fall through */
     case STATE_STORAGE_DOMAIN:
         if (menu->priv->files == NULL) {
             ovirt_foreign_menu_fetch_storage_domain_async(menu, task);
             break;
         }
+        /* fall through */
     case STATE_VM_CDROM:
         if (menu->priv->cdrom == NULL) {
             ovirt_foreign_menu_fetch_vm_cdrom_async(menu, task);
             break;
         }
+        /* fall through */
     case STATE_CDROM_FILE:
         ovirt_foreign_menu_refresh_cdrom_file_async(menu, task);
         break;
-- 
2.12.2

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